78 - 



their bodies become entirely filled with the mycelial threads 

 and spores of the fungus. In many cases, under certain condi- 

 tions, the spores partially cover the ^outside of the body also. 

 Several of the insects showing this latter condition are figured 

 herewith. (See Fig. 25, 1, 2, 3, A, 5, 6.) 



In breeding-cage experiments this SpovotricJiuui gave very 

 good results in a number of cases, while on the open camp soon 

 after the arrival of the voladoras from the north many were 

 seen to succumb and turn bright pink. These upon examina- 



Fig-, 25. — Saltonas killed hy the Cai-caraftá locust-fungus. (Original). 



tion gave large quantities of the same kind of spores and threads 

 as were found in the fungus-covered saltonas mentioned 

 above. They also imparted the same disease to other locusts 

 when powdered and sprinkled on the food of sound insects. 



At present the fungus is working very nicely in the vicinity 

 of Carcarañá, where it has already almost exterminated a good 

 sized manga of the insects. Here a very large supply of the 

 dead bodies of the insects can be obtained with which to spread 

 the disease to other mangas of the voladoras. 



The South African Locust Piingiis. 



Quite early in these investigations specimen-tubes of the 

 South African fungus were obtained and careful experiments 

 were also made on our locust with it. The results obtained, 



